Crank and pitman connection



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April 20,1926.

G. C. WILLIAMS CRANK AND PI TMAN CONNECTION Filed July 2,

will! etentcd Apr. 20, 1926.

FFEE.

GROVER C. WILLIAMS, OF BALTEMORE, MARYLAND.

CRANK AND PITMAN CONNECTION.

Application filed July 2,

To all whom it may concern.

Be it known that I, Gnovnn G. lViLLnmrs, a citizen of the United States, residing at Baltimore city, in the State of Maryland, have invented certain new and useful Improvements inCrank and Pitnian Connections, of which the following is a specification.

This invention relates to crank connections, and especially to an improved crank and pitman connection.

Que object of the invention is to provide an improved and exceedingly safe,-durable, eil ective and convenient connection of the class which permits of two or more pitnien being journalled on the same crank-journal.

Another object is to provide an improved connection of this character, which permits the pitinan or pitmen to be operatively connected to the crank without separating or affecting the normal state of the latter.

Another object is to provide an improved pitman comprising separable parts capable of being so interlocked with one another and with the crank, that they can not become accidentally separated.

Other objects and important features will be pointed out or implied in the following details of description, in connection with the accompanying drawings in which:

Fig. 1 is a sectional view in the plane of the axes of the crank-shaft which includes a crank formed in accordance witlrthis invention, the pitman being shown assembled and in the operative relation. Fig. 2 is an elevation of the crank and the central ele ment of the pitman, the latter element being shown as if being passed into its seated position on the cranlejournal. Fig. 3 is a sectional view, the section being taken transversely through the crank-journal, one'of the outer pitman sections and the inner or central pitman section being also shown, the latter being indicated (by the broken and full line positions) as'if being moved into its normal interlocking engagement with the outer pitman section. Fig. 41 is a perspective view of the inner and outer pitman elements or sections in a semi assembled position.

Referring to these drawings in detail, in which similar reference characters correspond to similar parts throughout the several views; it is seen that the two crankarms 5 are inseparably or integrally united with the crank-journal 6. Each crank-arm is formed with an inwardly extending an- 1924. Serial No. 723,716.

vexed surface 12 of the inner section 13 of the pitinan. A concaved surface let, of the inner section, fits slidingly on the crank journal. The shanks or stems of the parts 9 and 13 are provided with bolt-holes 15 and 16 through which a bolt 17 extends (see Fig. 1), and a cotter pin 18, or other nut-locking means, may be employed to insure that this bolt securely holds the parts 9 and 13 in the assembled and interlockedrelation with the crank, shown in Fig. 1.

it very important feature of this invention is its convenience in assembling and disassembling, and the facility with which the parts 9 and 13 may be removed from and replaced on the crank without affecting the relation or position of the latter. One way is here shown in connection with Fig. 3, where one or both of the parts 9 may be passed through the opening between the flanges 7, then seated in the recess in the natural depending position shown. In placing the inner section 18, its convene-concave parts 12-1 1 are passed through the opening between the flanges 7 until its surface 1 1 fits on the crank-journal 6, and, while being held thus against the crank-journal, it is slid around'the latter until its convexed surfaces slide into the normal fitting and interlocking relation, viz these convex surfaces sliding in and finally resting and fitting in) the concaved surfaces 11 of the parts 10. When the parts 9 and 13 are thus finally seated in the interlocking engagement, their shanks are fitting snugly against one another, and the bolt-holes are registering, so the bolt 17 and cotter pin 18 can then be placed for securing the parts in the interlocked working relation shown. The thickness of the pitman is greatly increased or reenforced at the point that is weakened by the bolt hole.

Either part 7 may be considered as a retaining element while the other part 7 is more specifically considered as a guide-channel, and either part 9 (when seated in locked relation with said retaining element and with the middle pitman-section 13) cooperates with the bolt 17. and with said retaining element and middle pitman-section for providing means to hold the other part 9 in the part 8 here referred to as a guide-channel.

While I have shown only one pitman crank connection, I have shown a construction capable of accommodating a second pit-- man of this kind, and it is quite within the scope of this invention to provide for several pitmen in a similar arrangement and connection.

It is not intended to limit this invention to the exact construction and arrangement here shown, for changes may be made within the scope of the inventive ideas as implied and claimed.

l/Vhat I claim as my invention is:

1. A crank and a pitman connection which includes a crank, and two pit-man sections, said crank including a crank journal and two crank arms and two inwardly facing guiding channels on said crank arms and surrounding said crank journal and in spaced relation to one another, said pitman sections being of proper shape to be inserted through the space between said guiding channels and movable respectively into sliding engagement with said guiding channels, and means to hold these pitman sections in such sliding engagement and in normally fixed relation to one another.

2. The crank and pitman connection which includes a crank having annular guidechannels around its crank-journal; and a, pit-man comprising two outer sections, an inner section, and means to secure these sections to one another and thereby form a unitary pitman structure; the outer pitman sections having conveXo-concave parts that slidingly fit in said guide-channels; the inner section having a concave part that fits and slides on said crank-journal; said means being removable; each of said sections being removable through the space between said guide channels when said means is removed, but being normally held by said means against such removal.

3. The crank and pitm an connection which includes a crank having annular guidechannels around its crank-journal; and a pitman comprising two outer sections, an inner section, and securing means which normally holds these sections in a unitary pitman structure, but permits them to be separated; each of the pitman sections being adapted to be passed into and out of working engagement with the crank-journal through a space between said guide-channels, said securing means and guide channels being cooperative for preventing removal of the unitary pitman structure.

4. The crank and pitman connection which includes a crank having an annular guiding channel around its crank-journal; and a p itman comprising two outer sections and an inner section provided with means to secure them in a unitary structure capable of being separated; said inner section being formed with convexed surfaces, and with a concaved surface to slidingly fit on said crank-journal, said outer sections each being provided with a concaved surface to slidingly' fit on the convexed surfaces of said inner section; each outer section having a convexo-concave part to slidingly lit in a respective one of the guide-channels, for the purposes specified.

In testimony whereof I affix my signature.

(moves 0. WILLIAMS. 

